Who did his book poke fun at?

It seems you're referring to a book that pokes fun at someone or a group of people, but you haven't specified which book you are talking about. Authors write satirical books targeting a wide array of individuals, professions, institutions, and aspects of society.

For example:

- "Animal Farm" by George Orwell is a satirical novel that pokes fun at the events leading up to the Russian Revolution of 1917 and then on into the Stalinist era of the Soviet Union.
- "Gulliver's Travels" by Jonathan Swift satirizes the nature of human society and the pretensions of the time it was written.
- "Don Quixote" by Miguel de Cervantes pokes fun at the chivalric traditions and romance novels of his time.
- "Slaughterhouse-Five" by Kurt Vonnegut pokes fun at the absurdity of war, among other things.
- "The Daily Show" and "The Colbert Report", each in book form or as television shows, often poke fun at politicians, media, and current events.

If you provide the name of the book or the author, I can give a more precise answer about who or what is the subject of the satire in that particular work.